Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe5999cc867a374…

MALICIOUS

PDF

73.9 KB Created: 2021-02-17 05:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62b95f2a34283277cc0db676dddbc2c8 SHA-1: 826b9ffc7d957fa13b966d6f4dfdcd548a276131 SHA-256: ebe5999cc867a37496a9d92dd1332f21a928b006062153be31a22de3cbcb4f48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, including one that appears to be a redirector for a link farm, and is flagged by ML and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to salary information, directing users to external sites. The presence of numerous distinct hosts and UTM parameters indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=how+much+does+a+pharmacy+cashier+make+at+walmart PDF link annotation
    • http://reduslim-italiaoficial.site/xemizidevenkohzr.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/jO1hjiI/51412401374.pdfIn PDF document text
    • http://sellforce.ru/marathon_electric_motor_wiring_diagram_3_phasecy8kx.pdfIn PDF document text
    • http://missunik.space/wefizobavigefanuzosapv5ixl.pdfIn PDF document text
    • http://zanartcc.net/baazigar_song_mp40n7th.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/examen_matematicas_5_primaria_santilhdj9y.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/ii4hjhe/basic_marketing_concepts.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/ehghbii/nature_sounds_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/tIT5xha/mediaf_re_minecraft_mods_bedrock.pdfIn PDF document text
    • http://opssmall.space/nutrition_for_dummieswyhou.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/rhhdHWp/planet_fitness_classic_membership_cancellation_fee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/17121914561.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/general_chemistry_2_grade_12_curriculum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/35750305118.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 5532 bytes
SHA-256: 7f8775c975162497d568b5ed71acfaad1ccfda33e9d0ac6a44ace8fe9b1eee78
font_01_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 11088 bytes
SHA-256: cc8e0855085b2f09c6d1ce87b341a72b5bc9a0c15474971df5271a256ff50aca

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